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Figure 4 The Change of APD₇₀ and Ca_iD₇₀ After MW and BW Shocks Delivered at Different Coupling Intervals

The MW and BW shocks resulted in different action potential duration between phase 0 and 70% repolarization (APD₇₀) and Ca_iD₇₀ when the coupling interval was short (160 ms) but not when the coupling interval was 300 ms. The optical signals were generated by averaging the fluorescence of the entire mapped region. Abbreviations as in Figure 2.